The Ann Arbor area has a bad track record for sustaining good quality taquerias. The laudable ones come and go (remember "Taco Boy"?). The ones that stand are of mixed quality (Tmaz, Taco King). That said, I have hopes for the newest arrivals.
La Torre Taqueria, 1525 Washtenaw, Ypsilanti
I haven't been yet, but the menu is straight-up tacos, tortas & menudo--and priced cheap for immigrant eaters.
Mi Compadre Restaurant, 2111 Packard, Ann Arbor
More of a full menu, including chicken w/ mole, Oaxacan specialties incl tlayudas, tortas (on home-baked rolls?!). Ate there in the "soft opening": food was so-so, prices were higher than local taquerias, service was a mess. My companion & I agreed that the food was neither good nor bad.
I also have my hopes pinned on
8 Tortas, soon to open at 3584 Plymouth Rd (Plymouth/Green shopping center), Ann Arbor.